Pool walls buckling while filling pool

New pool started filling pool about 6" water noticed walls on one side of pool buckling. Liner looked good when we started filling. Is this normal?

Is this a rectangular Intex pool?

No 24 round. Everything is acuarte on pool. Liner looked great.

I'm not an AGP installer, so this is not a question I can answer on my own. I poked around in past threads here, and on a number of other forums. It turns out the question, "Why are my AGP's walls buckling?" has been asked a LOT more times than it has been answered. As best I can tell, the two most likely answer are (1) an over-tensioned liner or (2) a pool base that is not completely level and stable. Please note that the liner may be OK on a hot day, but shrink enough when cold water is added, to cause a problem. The picture below, from the Artesian pool manual, illustrates the problem:

https://lh6.googleusercontent.com/-d...520install.jpg

You may want to check out these install manuals, as well:

http://www.doughboy-pools.com/Servic...G01DBSigOv.pdf
http://www.propools.com/instructions...structions.pdf
https://www.poolsupplies.com/pdfs/artesian-round.pdf